Just got an Xperia 8, which is on Orange, but bought via Carphone Warehouse as an update from T-Mobile. Yes, I know. 
So far, so good, enjoying the phone. But, with my old T-Mobile phone I could dial 150 and get an automated readout of my remaining credit.
Can this be done with Orange? I so, what's the number?

So far, so good, enjoying the phone. But, with my old T-Mobile phone I could dial 150 and get an automated readout of my remaining credit.
Can this be done with Orange? I so, what's the number?